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Morphology of the (a) ZnAc-PVP nanofibers, (b) ZnO-Fs formed by oxidation of (a) at 500 °C, (c) ZnO-H structure fabricated by hydrothermal method using ZnO-Fs in (b) as seed template, and (d) ZnO/CuO-H structure formed by decoration of CuO nanoparticles on structure in (c). Inset images in (a,b,d) show high magnification SEM. Inset image in (c) shows cross-section view.
